Heating furnace



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, I J- R. SANDAGE flEATING FURNACE Filed March 9, 1925 2 Sheets-Sheet 1J EGQZRSQ/ZQ /Q @m? W Oct. 19,1926. 1,603,925

J. R. SANDAGE uA-mq roams Filed March 9, 1925 2 Sheets-Sheet 2 Jacob J?a/wfcggz Patented- Oct. 19, 1926.

UNITED STATES PATENT OFFIQE.

JACOB R. SANDAGE, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO WARRENR.

SANDAGE, OF CHICAGO, ILLINOIS.

HEATING FURNACE.

Application filed March 9, 1925. Serial No. 13,946.

This invention relates to furnaces for heating houses and buildings, andmore particularly to those which employ some means for heating air forthis purpose, and for circulating the air through the furnace and intothe rooms to be heated.

Generally stated, the object of the invention is to provide a novel andimproved construction whereby the air will be brought into the furnaceand taken across the same, close to the lire, directly above the firepot of the furnace, so that the air will be more intensely heated, andwhereby a smaller fire will be more effective in heatin the air. and

" whereby even an oil burner or a gas burner.

when placed in the fire pot, will be more efficient for the heating ofthe air than is pos sible with the ordinary construction of coalburninghot air furnace.

It is also an object to provide certain details and features ofconstruction and combinations tending to increase the general efficiencyand desirability of a heating furnace of this particular construction.

To these and other useful ends, the invention consists in the mattershereinafter set forth andclaimed, and shown in the accompanyingdrawings, in which:

Fig. 1 is a vertical section of a hot air heating furnace embodying theprinciples of the invention;

Fig. 2 is a horizontal section on line 22 'F-ig. 3 is a horizontalsection on line 3-3 in Fig. 1.-

As thus illustrated, the invention comprises an outer furnace casing 1of any suit- ;able or desired form or character, together with a firepot 2, of any suitable or desired character therein. An upper door 3 isprovided for the introduction of the fuel into the fire pot,and thelower door t. is provided for the withdrawal of the ashes which aredumped into the ash pit below. pipe 5 is provided, as shown, leadingfrom the upper portion of the casing of the furnace, thereby to providean outlet for the a smoke and products of combustion.

A heating drum 6 is provided in the upper portion of the casing, asshown, with space 7 between the sides of the drum and the casing-of thefurnace. This drum has its up per portion enlarged and provided with oneor more outlets 8 for the escape of the heated air. The lower portion ofthe drum is pro A smoke culates around the fire pot 2, and around thelower portion of the wall 13 of the furnace casing before being drawninto the space 10, and from the latter into the heating drum 6,previously mentioned. Thus, the air is first heated by circulationaround the fire pot, and is then heated in the drum 6, and it will beobserved that when the air enters the drum, it does so directly over thefire and directly over the bottom wall 14 of the heating drum, where theheat is most intense, raising the air to a high temperature in thebottom portion of the drum. The smoke and products of combustion passupwardly in the space 7, thus heating the sides of the drum 6, so thatthe interior of the lower portion of the drum is subjected at all sidesthereof, and below, to the full force of the heated gases rising fromthe fire.

\Vith this arrangement, therefore, a smaller-fire can be employed, and,if desired, an oil burner or a gas burner may be used effectively in thefire pot. In other words, the air is given a preliminary heating aroundthe outside of the fire pot, and is then in tensely heated when itenters the lower por tion of the heating drum, directly over the fire,andwith an arrangement of this kind, involving the bringing of the airvery close to the fire, it is obvious that the air can be effectivelyheated with less fuel than would be required with some otherconstructions.

It will also be observed that the air is taken into the heating drum 6in a manner to keep the bottom thereof from burning out, inasmuch as theair, although it is heated by circulation around the fire pot, is at arelatively low temperature when it enters the bottom of the drum, andthe baffle 9 keeps the air that has just entered down against the bottomof the drum in a manner to prevent the bottom wall of the drum fromburning out. Of course, this bottom wall of the drum can be made of anysuitable known or approved material, and can be made of some specialmaterial which will not be liable to burn out even though the air werenot being circulated throughout the furnace.

The lower portion of the furnace It willbe understood, of course,thatthe drum 6' isgas-tight, so that no gases or prodnets of combustionrising with the fire can enter and mingle with the air. The bottom Wall14: of the drum is inipertorate, and hence the space 7 constitutes theonly passage for the smoke and products of combustion'upwardly to thesmoke pipe 5 through which the smoke is allowed to escape from these"plates form the top and bottom walls of the lateral intake of thedrum.This leaves thetrontportion of the space between the loweredge ot thedrum and the upper edge ot the fire pot open, for the upward passageot'the smokeand gases, and the latter then pass over the plate 14 into thesmoke pipe, which latter is directly above the said'intake of the drum.Thus the air enters thedrui'n and spreads out upon the fiat back wallthereof, so as to receive the maximum heat from the fire upon entranceinto thedrum, and thebafile 9, which is in the plane of the top plate 14ot the intake, tends tokeep the incomingair downupon the bottom wall ofthe drum to not only heat the air effectively, but also to keep the saidbottom wall 1th from becoming overheated and burning out, the airentering and absorbing the heat so promptly that the temperature of thebottoin'wall is muchless' liable to burn out 'than'inight otherwise bethe case it it t'y'GlQIiOt constantly giving up its heatto the incomingair.

out prejudice to any novelty disclosed, what I claim as my invention is:

1. In a heating furnace for heating air, the combination of a furnacecasing and a fire pot therein, an air heating drum suspended in theupper portion of the furnace casing, with its bottom wall concentric tothe top of 'said fire pot, forheating all the air passing through thefurnace, and of less diameter than the top'of'tlie fire pot, anddisposed position directly over the fire pot, "said drum having anintake directly ove 'tlie rear edge of the fire'pot toradmittiiignii-"laterally through the side of the lower portion of theheating drum, so that the air enters and spreads directly over and uponsaid bottom wall, whereby all air taken in and heated by the furnacemust pass through said drum, with space around the outside of the'druinfor the passage of smoke and the products of combustion, a smoke pipeleading from the upper portion of said space around the outside of theheating drum, whereby the bottom and sides of said drum are heated, andan outlet for the upper portion of said drum, forming a hot air ofi'-take for the furnace, whereby only air passing through said drum canescape through said'oil'take, said intake closinga portion of theannular space between the drum" and the upper edge of the fire pot,leavin the front portion of said space unobstructed to permit upwardescape of the products of combustion 'froin the firepot, anda top wallfor said intake over said closed portion of said space,

over which top plate the products of coin bustion pass to said smokepipe. 7 V

2. A structure as specified in claim 1, lIl combination with a.horizontally disposed bafile in said drum, in theplane of said top wall,immediately above the lateral airin take thereot, whereby the airenters" and flows across the bottom wall of the drum, and then risesbetwe-eii"tlie farther side of the drum and tie edge or said battle.

3. A structure as specifiedin claim 1, in?

combination with means for the passag e of air around the outside ofsaid fire pot," before the passageot' air into the drum through the saidintake thereof, thereby to preliminarily heat all of the air passingthroughthe furnace, betore'it enters said drum.

'4. A structure asspecified in claim 1, comprising instrumentalities foradmitting the air and first circulating it around thefire pot, beforethe air passes 'into' said drum,

thereby to preliminarily heat allot the air passing through the furnace,said instru mentalit es including a horizontally "disposed b'afileextending partially around the fire pot, below said intake of the drum,Without disclai ning anything, and withwhereby the air is caused toenter atone side of the base portion of the furnacecasing,

below said intake of the drum, and then travel across to the other side,at each side of the fire pot, andthenupwardly'betweeii the rate, andsaid space around the outside of the drum constituting the only'pa ssagefor the smoke and products otcoinbustion upwardly to the smoke pipe,therebeingfan air' heating chamber overhanging the top of said smokespace, forming an' e'nlarged head 'for" said drum.

Specification signed 7 this. Qn k bf March, 1925. V y

' JACOB 'RJSANDAGE.

